/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.activiti.engine.impl.form;

import java.text.Format;
import java.text.ParseException;
import java.text.SimpleDateFormat;

import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.form.AbstractFormType;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.time.FastDateFormat;

/**
 * @author Tom Baeyens
 */
public class DateFormType extends AbstractFormType {

	protected String datePattern;
	protected Format dateFormat;
	private static final String PATTERN = "yyyy-MM-dd";

	public DateFormType(String datePattern) {
		this.datePattern = datePattern;
		this.dateFormat = FastDateFormat.getInstance(datePattern);
	}

	public String getName() {
		return "date";
	}

	public Object getInformation(String key) {
		if ("datePattern".equals(key)) {
			return datePattern;
		}
		return null;
	}

	public Object convertFormValueToModelValue(String propertyValue) {
		if (StringUtils.isEmpty(propertyValue)) {
			return null;
		}
		SimpleDateFormat sdf = new SimpleDateFormat(PATTERN);
		try {
			return sdf.parse(propertyValue);
		} catch (ParseException e) {
			throw new ActivitiIllegalArgumentException("invalid date value "
					+ propertyValue + "for " + PATTERN);
		}
	}

	public String convertModelValueToFormValue(Object modelValue) {
		SimpleDateFormat sdf = new SimpleDateFormat(PATTERN);
		if (modelValue == null) {
			return null;
		}
		return sdf.format(modelValue);
	}
}
